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  <div class="section" id="support-for-qt-interfaces">
<h1>Support for Qt Interfaces<a class="headerlink" href="#support-for-qt-interfaces" title="Permalink to this headline">¶</a></h1>
<p>PyQt5 does not, generally, support defining a class that inherits from more
than one Qt class.  The exception is when inheriting from classes that Qt
defines as <em>interfaces</em>, for example
<a class="reference internal" href="api/qtextobjectinterface.html#PyQt5.QtGui.QTextObjectInterface" title="PyQt5.QtGui.QTextObjectInterface"><tt class="xref py py-class docutils literal"><span class="pre">QTextObjectInterface</span></tt></a>.</p>
<p>A Qt interface is an abstract class contains only pure virtual methods and is
used as a mixin with (normally) a <a class="reference internal" href="api/qobject.html#PyQt5.QtCore.QObject" title="PyQt5.QtCore.QObject"><tt class="xref py py-class docutils literal"><span class="pre">QObject</span></tt></a> sub-class.  It
is often used to define the interface that a plugin must implement.</p>
<p>Note that PyQt5 does not need an equivalent of Qt&#8217;s <tt class="docutils literal"><span class="pre">Q_INTERFACES</span></tt> macro in
order to use an interface class.</p>
<p>The <tt class="docutils literal"><span class="pre">textobject.py</span></tt> example includedd with PyQt5 demonstrates the use of an
interface.</p>
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